<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <input type="text" placeholder="用户名" v-model="user.username">
    <input type="text" placeholder="密码" v-model="user.password">
    <input type="text" placeholder="昵称" v-model="user.nickname">
    <input type="button" value="注册" @click="reg()">
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
 <script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
     <script>
         let v = new Vue({
             el:"body>div",
             data:{
                 user:{username:"",password:"",nickname:""}
             },
             methods:{
                 reg(){
                     axios.post("/reg",v.user).then(function (response) {
                        if(response.data==1){
                            alert("注册成功")
                            location.href="/"
                        }else {
                            alert("用户已存在~！")
                        }
                     })
                 }
             }

         })
     </script>
</body>
</html>